unit 4 test physics

Question 1

which of the following types of cancers has not been demonstrated?

Answer 1

colon

Question 2

which of the following factors will have the least on the radiation exposure to the patient if the mAs and kVp remain constant?

Answer 2

focal spot size

Question 3

which of the following is the most commonly occurring radiation induced cancer?

Answer 3

lukemia

Question 4

first sign of radiation syndrome following a large dose of radiaiton is usually?

Answer 4

nausea

Question 5

the time radiaiton symptoms and signs or symptoms are primarily absent?

Answer 5

latent period

Question 6

the stage where radiation has an all or none effect is?

Answer 6

pre gestation

Question 7

central nervous system syndrome that occurs with a total exposure of at least 5000 rads will ultimately cause death in?

Answer 7

1-3 days

Question 8

manifest illness period with acute exposure to radiation occurs to the time during which?

Answer 8

the effects of the exposure are apparent

Question 9

which of the following responses of ionizing radiation would be characterized as a stochastic effect?

Answer 9

lukemia

Question 10

radiation lethality follows which dose response relationship?

Answer 10

sigmoid threshold (non linear)

Question 11

the LD50/30 refers to?

Answer 11

lethal dose whole body radiation to 50 percent of exposed in 30 days

Question 12

which of the following is a delayed local tissue effect?

Answer 12

cataracts

Question 13

what is the term used to describe the normal occurence of a disease?

Answer 13

endemic

Question 14

which of the dose response effects describes the following, increased dose=increased probablities of effects?

Answer 14

stochastic effects

Question 15

which of the following radiation responses in utero is most likely to occur in major organogensis?

Answer 15

congential abnormalities

Question 16

major organogenesis begins?

Answer 16

2 weeks to the end of the 6th week

Question 17

the deaths related to large exposures or radiation are not related to damage of which of the following?

Answer 17

reproductive system

Question 18

which of the following is needed to calculate the dose recieved by a fetus after a radiographic period?

Answer 18

x-ray output

Question 19

if the filtration of a radiographic unit are omitted for a series of chest exposures, the greatest increase of exposures would occur in the

Answer 19

skin of the chest

Question 20

which of the following are not likely to reduce the repeat rate for radiographic images?

Answer 20

high ratio grid

Question 21

the patient dose in fluoro may be minimized by?

Answer 21

restricting the field size

Question 22

luekemia has a typical latent period of?

Answer 22

5 to 10 years

Question 23

which of the following is considered a late effect following a large radiation dose?

Answer 23

carcinogensis

Question 24

when the fetus is most sensitive to radiation?

Answer 24

the 1st trimester

Question 25

early radiation therapy treatment to the thymus gland has resulted in some cases of?

Answer 25

thyroid cancer

Question 26

equivalent dose limits for radiation workers is based on the radiation recieved from which of the following sources?

Answer 26

occupational exposure

Question 27

which of the following will reduce patient exposure during a fluoro study?

Answer 27

intermittent exposures

Question 28

what dose response best illustrates cataracts that does not occur at low radiation exposure?

Answer 28

threshold

Question 29

hematopoetic syndrome of ARS will occur at a whole body dose of?

Answer 29

1Gy

Question 30

out of all the ways to measure radiation dose, which is easiest to measure?

Answer 30

entrance skin dose

Question 31

which of the following can be used as a predictor of leukemia?

Answer 31

mean marrow dose

Question 32

when are embryogenic effects most likely to occur?

Answer 32

1st trimester

Question 33

which of the following is the target responsible for radiation induced luekemia?

Answer 33

bone marrow

Question 34

the recommended dose are based upon which type of dose response relationship?

Answer 34

linear non threshold

Question 35

recommended dose limits for the general public are set at a risk rate of?

Answer 35

1/10th of radiographers

Question 36

the annual dose limit for the lens of the eye for occupational worker is?

Answer 36

15 rem or 150 mSv

Question 37

annual dose limit for the upper extremities for an occupational worker is?

Answer 37

50 rem or 500mSv

Question 38

the recommended dose limit for frequently exposed members of the general public are?

Answer 38

.1 rem or 1 mSv a year

Question 39

radiographic beam should be collimated so it is which of the following?

Answer 39

no larger than the image receptor

Question 40

what is the function of filtration during radiographic procedures?

Answer 40

increase beam qualities therefore reducing radiation dose

Question 41

genetic effects follow which of the dose-response relationships?

Answer 41

linear non threshold

Question 42

most effective way of reducing pateint dose is?

Answer 42

high kv low has

Question 43

NRC

Answer 43

Governs the use of radiation and enforces both equipment standards and radiation safety practices.

Question 44

ICRP

Answer 44

makes recommendations only to the NCRP etc.

Question 45

NAS-BEIR:

Answer 45

Advisory group that reviews studies of biological effects of ionizing radiation and risk assessment.

Question 46

Radiation Control for Health and Safety Act of 1968

Answer 46

This law set equipment standards contained in 21 CFR

Question 47

Safe Devices Medical Act of 1991

Answer 47

This law requires medical facilities to report to the FDA and the manufacturer any medical device that has caused death or serious injury to any patient or employee. It also authorizes civil penalties to health care workers who do not report these defects and failures.